Web Management Guide

Table Of Contents
Chapter 19
| Multicast Routing
Configuring PIMv6 for IPv6
– 635
Configuring a PIM6 RP
Candidate
Use the Routing Protocol > PIM6 > PIM6-SM (RP Candidate) page to configure the
switch to advertise itself as a Rendezvous Point (RP) candidate to the bootstrap
router (BSR).
Command Usage
When this router is configured as an RP candidate, it periodically sends PIMv2
messages to the BSR advertising itself as a candidate RP for the specified group
addresses. The IP address of the designated VLAN is sent as the candidates RP
address. The BSR places information about all of the candidate RPs in
subsequent bootstrap messages. The BSR uses the RP-election hash algorithm
to select an active RP for each group range. The election process is performed
by the BSR only for its own use. Each PIM6-SM router that receives the list of RP
candidates from the BSR also elects an active RP for each group range using the
same election process.
The election process for each group is based on the following criteria:
Find all RPs with the most specific group range.
Select those with the highest priority (lowest priority value).
Compute hash value based on the group address, RP address, priority, and
hash mask included in the bootstrap messages.
If there is a tie, use the candidate RP with the highest IP address.
This distributed election process provides faster convergence and minimal
disruption when an RP fails. It also serves to provide load balancing by
distributing groups across multiple RPs. Moreover, when an RP fails, the
responsible RPs are re-elected on each router, and the groups automatically
distributed to the remaining RPs.
To improve failover recovery, it is advisable to select at least two core routers in
diverse locations, each to serve as both a candidate BSR and candidate RP. It is
also preferable to set up one of these routers as both the primary BSR and RP.
Parameters
These parameters are displayed:
VLAN
– Identifier of configured VLAN interface. (Range: 1-4093)
Interval
– The interval at which this device advertises itself as an RP candidate.
(Range: 60-16383 seconds; Default: 60 seconds)
Priority
– Priority used by the candidate RP in the election process. The RP
candidate with the largest priority is preferred. If the priority values are the
same, the candidate with the larger IP address is elected to be the RP. Setting
the priority to zero means that this router is not eligible to server as the RP.
(Range: 0-255; Default: 0)